> Which is absurd, considering it's involved in college admission process.
Your SAT score is just about the only bit of the admission process you have access to. You don't get the admissions officers' opinions on your essay, what they thought of your extracurriculars, how they perceive the reputation of your high school, what their alumni interviewers said, etc.
(Chances are you can make a pretty good guess at what the adversity score is going to be, too.)